Cooper and hunter mini split error code ec 54.

Anyone had expirience with these? What can I do about an Ec 54 error code (Compressor discharge temperature sensor error (T5). Also checked pressure earlier and it was at 0, so apparently I have a leak somewhere and is it related to the code it's giving? I'm new to the trade and this is my personal unit, any info will help thanks. I charged the unit back up to the 1.5 pounds that it calls for and still have an error code and checked for a leak and can't seem to find it.